When you format ,you can still experience the issue and if that happens than you have a damaged sd card ,this same problem came up on my old wildfire with a bad sd card from ebay .
Sent from my HTC EVO 3D X515m using XDA
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CURRENT DEVICE: LG OPTIMUS 4X HD
ROM: BEANSTALK [4.4.2]
KERNEL : iodak v9
SUPERCHARGED HTC EVO 3D
HBOOT: S-OFF Revolutionary 1.49.1107
ROM: CM10.1 UNOFFICIAL
KERNEL:Anryl/Johnnys CM kernel